Diagnostic kits for use in a method for differentiation between IBD and IBS comprising at least two antibodies directed to at least two proteins or protein fragments chosen from the group comprising the following proteins (protein accession no.): SLC6A14 (NP_009162); SLC26A2 (NP_000103); GRO-1 (NP_001502); MMP-7 (NP_002414); MAP-17 (NP_005755); RegIV (NP_114433); and Vanin-1 (NP_004657).
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